Sheldon’s search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
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Leonard’s mother (Christine Baranski) visits, which pleases Sheldon but upsets Leonard. .
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Sheldon attempts to help Penny understand Leonard’s work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend.
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Barry Kripke embarrasses Sheldon on NPR, and the gang rallies to help him get his revenge. Wolowitz, desperate to keep his romance with Bernadette alive, gets advice from a fantasy version of Katee Sackhoff.
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A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
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Sheldon teaches Leonard how to understand football while a kite-fighting incident threatens Howard and Raj’s friendship

Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends.

Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.

Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behavior modification experiment on Penny.

Sheldon and Howard wager comic books over a cricket’s species. Meanwhile, a less-than-perfect romantic night agonizes Leonard and Penny.